Abstract
Sexual dimorphism occurs regarding carbon and nitrogen metabolic processes in response to nitrogen supply. Differences in fixation and remobilization of carbon and allocation and assimilation of nitrogen between sexes may differ under severe defoliation. The dioecious species Populus cathayana was studied after two defoliation treatments with two N levels. Males had a higher capacity of carbon fixation because of higher gas exchange and fluorescence traits of leaves after severe long-term defoliation under deficient N. Males had higher leaf abscisic acid, stomatal conductance and leaf sucrose phosphate synthase activity increasing transport of sucrose to sinks. Males had a higher carbon sink than females, because under N-deficient conditions, males accumulated >131.10% and 90.65% root starch than males in the control, whereas females accumulated >40.55% and 52.81%, respectively, than females in the control group. Males allocated less non-protein N (NNon-p) to leaves, having higher nitrogen use efficiency (photosynthetic nitrogen use efficiency), higher glutamate dehydrogenase (GDH) and higher leaf GDH expression, even after long-term severe defoliation under deficient N. Females had higher leaf jasmonic acid concentration and NNon-p. The present study suggested that females allocated more carbon and nitrogen to defense chemicals than males after long-term severe defoliation under deficient N.
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Claims 10
Claim · model-written summary
Male Populus cathayana had a higher carbon fixation capacity, with higher leaf gas exchange and fluorescence traits, after severe long-term defoliation under deficient N.
Verbatim
t0“Populus cathayana”
e1“Males had a higher capacity of carbon fixation because of higher gas exchange and fluorescence traits of leaves after severe long-term defoliation under deficient N”
Claim · model-written summary
Males had higher leaf abscisic acid, stomatal conductance and leaf sucrose phosphate synthase activity.
- Taxon
- Populus cathayanaPopulus cathayanat0
- Material
- Malese1
- Outcome
- leaf abscisic acid, stomatal conductance and leaf sucrose phosphate synthase activitye1
- Direction
- highere1
Verbatim
t0“Populus cathayana”
e1“Males had higher leaf abscisic acid, stomatal conductance and leaf sucrose phosphate synthase activity”
Claim · model-written summary
Under N-deficient conditions, males accumulated more than 131.10% and 90.65% more root starch than control males.
Verbatim
t0“Populus cathayana”
e1“under N-deficient conditions, males accumulated >131.10% and 90.65% root starch than males in the control”
Claim · model-written summary
Under N-deficient conditions, females accumulated more than 40.55% and 52.81% more root starch than control females.
Verbatim
t0“Populus cathayana”
e1“under N-deficient conditions, males accumulated >131.10% and 90.65% root starch than males in the control, whereas females accumulated >40.55% and 52.81%, respectively, than females in the control group”
Claim · model-written summary
Males allocated less non-protein N (NNon-p) to leaves.
Verbatim
t0“Populus cathayana”
e1“Males allocated less non-protein N (NNon-p) to leaves”
Claim · model-written summary
Males had higher photosynthetic nitrogen use efficiency.
- Taxon
- Populus cathayanaPopulus cathayanat0
- Outcome
- photosynthetic nitrogen use efficiencye1
- Direction
- highere1
Verbatim
t0“Populus cathayana”
e1“higher nitrogen use efficiency (photosynthetic nitrogen use efficiency)”
Claim · model-written summary
Males had higher glutamate dehydrogenase (GDH).
- Taxon
- Populus cathayanaPopulus cathayanat0
- Outcome
- glutamate dehydrogenase (GDH)e1
- Direction
- highere1
Verbatim
t0“Populus cathayana”
e1“higher glutamate dehydrogenase (GDH)”
Claim · model-written summary
Males had higher leaf GDH expression.
- Taxon
- Populus cathayanaPopulus cathayanat0
- Outcome
- leaf GDH expressione1
- Direction
- highere1
Verbatim
t0“Populus cathayana”
e1“higher leaf GDH expression”
Claim · model-written summary
Females had higher leaf jasmonic acid concentration and non-protein N (NNon-p).
- Taxon
- Populus cathayanaPopulus cathayanat0
- Material
- Femalese1
- Outcome
- leaf jasmonic acid concentration and NNon-pe1
- Direction
- highere1
Verbatim
t0“Populus cathayana”
e1“Females had higher leaf jasmonic acid concentration and NNon-p”
Claim · model-written summary
The authors suggest that females allocated more carbon and nitrogen to defense chemicals than males after long-term severe defoliation under deficient N.
Verbatim
t0“Populus cathayana”
e1“females allocated more carbon and nitrogen to defense chemicals than males after long-term severe defoliation under deficient N”